In the studies by David Tilman of the University of Minnesota and John Downing of the University of Iowa, reported
in the journal Nature in 1994, they established and monitored 207 plots of Minnesota grasslands for seven years. During
the study period, Minnesota's worst drought in 50 years occurred (1987-1988). The ecologists found that those plots with
the greatest number of plant species lost ____ ground cover, as measured by dry weight, and recovered faster than
species-poor plots.
a. less
b. more
c. no detectable
d. only deciduous
e. detectable
a
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There is an influx of which ion into the synaptic knob triggering the vesicles containing neurotransmitter to move towards the presynaptic membrane
A) calcitonin. B) calcitriol. C) calmodulin. D) calcium E) calcitropin.
Losing an exoskeleton in order to grow is called what?
What will be an ideal response?
For a stem that has a vascular cylinder, which sequence of structures is in the correct order, from outside to inside?
a. stele ? epidermis ? pith ? cortex b. epidermis ? cortex ? stele ? pith c. stele ? cortex ? epidermis ? pith d. cortex ? stele ? pith ? epidermis
Eukaryotes differ from prokaryotes in that eukaryotes
A. Generally lack sterols in their cell membrane B. Contain more than one chromosome C. Lack 80?s ribosome D. Have peptidoglycan